Log Message:
Update to 1.99.09, a 2.0 release candidate.
Upstream changes:
   - Support the CACHE instruction as (for now) a nop.
   - Provide the MIPS32 config0 and config1 registers, and pretend to
     have 4K each L1 I/D caches. The cache remains fully coherent.
   - Don't allow r2000/r3000 (mips-I) style cache flushes.
   - Add a disk161 utility for manipulating disk images, and don't
     keep disk image sizes in sys161.conf any more.
   - Edit/revise the processor docs.
   - Fix build with gcc 4.8.
   - Provide flock() compat for legacy OSes without it. (Hi, Solaris.)